This CL moves the bulk of the SkyView code out of the |framework| directory because the |framework| directory was redundant in Dart package import declarations. TBR=ianh@google.com Review URL: https://codereview.chromium.org/1177383006.
R=ianh@google.com, eseidel@chromium.org Review URL: https://codereview.chromium.org/1178293004.
R=abarth@chromium.org Review URL: https://codereview.chromium.org/1173233002